scholarly journals Analysis of Mechanical Properties of Fabrics of Different Raw Material

1970 ◽  
Vol 17 (2) ◽  
pp. 168-173 ◽  
Author(s):  
Aušra ADOMAITIENĖ ◽  
Eglė KUMPIKAITĖ
Keyword(s):  
Mechanical Properties ◽  
Friction Coefficient ◽  
Structure Factor ◽  
Static Friction ◽  
Raw Material ◽  
Breaking Force ◽  
Material Density ◽  
Elongation At Break ◽  
Static Friction Coefficient ◽  
Fabric Structure

The study analyzes dependence of mechanical properties (breaking force, elongation at break, static friction force and static friction coefficient) on integrated fabric structure factor j and raw material density r, among the fabrics of different raw material (cotton, wool, polypropylene, polyester and polyacrylnitrile) and woven in different conditions. The received results demonstrate that sometimes strong dependences exist (wool, polypropylene and polyacrylnitrile), whereas in some cases (cotton and polyester) there is no correlation. It was also discovered that the breaking force and elongation at break in the direction of weft increase, when fabric structure becomes more rigid. In the meantime variations of the curves in the direction of warp are insignificant. Regarding static friction force and static friction coefficient (found in two cases, when fabrics were rubbing against leather and materials), it was discovered that consistency of the curves is irregular, i. e. they either increase or decrease, when integrated fabric structure factor j growth. It was also identified that some dependences are not strong and relationship between explored and analyzed factors does not exist. Variation of all these mechanical properties with respect to material density r enables to conclude that increase of material density r results in poor dependences or they are whatsoever non-existent.http://dx.doi.org/10.5755/j01.ms.17.2.487

scholarly journals Analysis of Woven Fabric at the Place of the Sewn Seam

2018 ◽  
Vol 18 (3) ◽  
pp. 216-220 ◽  
Author(s):  
Beti Rogina-Car ◽  
Ivana Schwarz ◽  
Stana Kovačević
Keyword(s):  
Mechanical Properties ◽  
Material Properties ◽  
Raw Material ◽  
Woven Fabric ◽  
Breaking Force ◽  
Time Intervals ◽  
Elongation At Break ◽  
Test Conditions ◽  
Stretching Intensity

Abstract Key importance and the role of sewn seam in the woven fabric are presented. Fabric properties in the places joined with the sewn seam on which garment durability, applicability, appearance and quality depend are highlighted. Seam location is usually the weakest spot on the garment, especially when the great loads are present at these places. Mechanical properties of the sewn fabrics were investigated in different test conditions. The influence of the load on the sewn seam is analyzed in time intervals. Sample with seam have approximately 70% lower breaking properties (breaking force and elongation at break) than the sample without seam. By preloading the seam fabrics with 30%, 50% and 70% of elongation at break, for a 3-h period, the effect on mechanical properties were tested and the differences in pre-stretching intensity were observed. By conducting such test, it is expected that the fabric experience further degradation and that breaking properties further reduce, but the exact opposite occurred (breaking properties, by increasing the preload, increase even more), because of various material properties (structural fabric properties, raw material characteristics, seam characteristics).

Experimental Study on Mechanical Properties of Sole Materials of Aerobics Sports Shoes

2011 ◽  
Vol 341-342 ◽  
pp. 77-79 ◽  
Author(s):  
Qin Er Qiu ◽  
Qiu Li Hu ◽  
Yao Dong Gu
Keyword(s):  
Mechanical Properties ◽  
Friction Coefficient ◽  
Static Friction ◽  
Mechanical Effect ◽  
Average Pressure ◽  
Biomechanical Test ◽  
Static Friction Coefficient ◽  
Mean Pressure ◽  
Almost All ◽  
Sports Shoes

The purpose of this study was to understand damping and anti-slip properties of the Reebok and the Huakang shoes, evaluate the mechanical effect of those aerobics sports shoes as well. From the biomechanical test, almost all mean pressure, average impulse and average pressure of the Reebok and the Huakang was less than the bare foot condition on "shoes - ground", but the average pressure, average impulse and average pressure of the Reebok shoes was slightly higher than the Huakang shoes. Meanwhile, the damping mechanics indexes do not exist significant differences (P＞0.05). It’s friction coefficient tests show that dynamic or static friction coefficient of the Reebok is superior than the Huakang, and dynamic or static friction coefficient does exist significant differences (P＜0.05).

Measurements of the Static Friction Coefficient Between Tin Surfaces and Comparison to a Theoretical Model

2011 ◽  
Vol 133 (3) ◽  
Author(s):  
Rebecca D. Ibrahim Dickey ◽  
Robert L. Jackson ◽  
George T. Flowers
Keyword(s):  
Theoretical Model ◽  
Friction Coefficient ◽  
Human Error ◽  
Surface Profile ◽  
Static Friction ◽  
Quantitative Agreement ◽  
High Plasticity ◽  
Static Friction Coefficient ◽  
Experimental Apparatus ◽  
Rough Surface Contact

A new experimental apparatus is used to measure the static friction between tin surfaces under various loads. After the data is collected it is then compared to an existing theoretical model. The experiment uses the classical physics technique of increasing the incline of a plane and block until the block slides. The angle at the initiation of sliding is used to find the static friction coefficient. The experiment utilizes an automated apparatus to minimize human error. The finite element based statistical rough surface contact model for static friction under full stick by Li, Etsion, and Talke (2010, “Contact Area and Static Friction of Rough Surfaces with High Plasticity Index,” ASME Journal of Tribology, 132(3), p. 031401) is used to make predictions of the friction coefficient using surface profile data from the experiment. Comparison of the computational and experimental methods shows similar qualitative trends, and even some quantitative agreement. After adjusting the results for the possible effect of the native tin oxide film, the theoretical and experimental results can be brought into reasonable qualitative and quantitative agreement.

scholarly journals Brittle Fracture Theory Describes the Onset of Frictional Motion

2019 ◽  
Vol 10 (1) ◽  
pp. 253-273 ◽  
Author(s):  
Ilya Svetlizky ◽  
Elsa Bayart ◽  
Jay Fineberg
Keyword(s):  
Friction Coefficient ◽  
Brittle Fracture ◽  
Static Friction ◽  
Quantitative Agreement ◽  
Interface Fracture ◽  
Earthquake Dynamics ◽  
Rupture Dynamics ◽  
Static Friction Coefficient ◽  
Fracture Theory ◽  
Macroscopic Motion

Contacting bodies subjected to sufficiently large applied shear will undergo frictional sliding. The onset of this motion is mediated by dynamically propagating fronts, akin to earthquakes, that rupture the discrete contacts that form the interface separating the bodies. Macroscopic motion commences only after these ruptures have traversed the entire interface. Comparison of measured rupture dynamics with the detailed predictions of fracture mechanics reveals that the propagation dynamics, dissipative properties, radiation, and arrest of these “laboratory earthquakes” are in excellent quantitative agreement with the predictions of the theory of brittle fracture. Thus, interface fracture replaces the idea of a characteristic static friction coefficient as a description of the onset of friction. This fracture-based description of friction additionally provides a fundamental description of earthquake dynamics and arrest.

scholarly journals A Novel Process for Manufacturing High-Friction Rings with a Closely Defined Coefficient of Static Friction (Relative Standard Deviation 3.5%) for Application in Ship Engine Components

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 448
Author(s):  
Wojciech S. Gora ◽  
Jesper V. Carstensen ◽  
Krystian L. Wlodarczyk ◽  
Mads B. Laursen ◽  
Erica B. Hansen ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Friction Coefficient ◽  
Relative Standard Deviation ◽  
Static Friction ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Textured Surface ◽  
Fibre Lasers ◽  
Static Friction Coefficient ◽  
Relative Standard

In recent years, there has been an increased uptake for surface functionalization through the means of laser surface processing. The constant evolution of low-cost, easily automatable, and highly repeatable nanosecond fibre lasers has significantly aided this. In this paper, we present a laser surface-texturing technique to manufacture a surface with a tailored high static friction coefficient for application within driveshafts of large marine engines. The requirement in this application is not only a high friction coefficient, but a friction coefficient kept within a narrow range. This is obtained by using nanosecond-pulsed fibre lasers to generate a hexagonal pattern of craters on the surface. To provide a suitable friction coefficient, after laser processing the surface was hardened using a chromium-based hardening process, so that the textured surface would embed into its counterpart when the normal force was applied in the engine application. Using the combination of the laser texturing and surface hardening, it is possible to tailor the surface properties to achieve a static friction coefficient of ≥0.7 with ~3–4% relative standard deviation. The laser-textured and hardened parts were installed in driveshafts for ship testing. After successfully performing in 1500 h of operation, it is planned to adopt the solution into production.

scholarly journals Active Sensing of Static Friction Coefficient ^|^mu; for Controlling Grasping Force

1994 ◽  
Vol 30 (10) ◽  
pp. 1188-1194 ◽  
Author(s):  
Youji YAMADA ◽  
Kenji SANDA ◽  
Kazuhide FUJITA ◽  
Nuio TSUCHIDA ◽  
Kouji IMAI
Keyword(s):  
Friction Coefficient ◽  
Static Friction ◽  
Active Sensing ◽  
Static Friction Coefficient ◽  
Grasping Force
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